Alert archive / Illinois / Flash Flood Warnings in 1998

Flash Flood Warning 10, NWS Chicago, IL

June 26, 1998Boone County, Illinois

NWS Chicago, IL issued this flash flood warning at Jun 26, 1998, 6:00 PM CDT for Boone County, Illinois. It was in force for 12 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 26, 1998, 6:00 PM CDT (23:00 UTC)
Expired: Jun 27, 1998, 6:00 AM CDT
In force: 12 hr
Issued by: NWS Chicago, IL
Area: Whole counties

County Boone County, IL

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.0 hours before the alert went out and 159 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2175 J/kg
Mixed-layer CIN: -85 J/kg
Mixed-layer LCL: 1174 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 89 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jun 26, 4:05 PM CDT, 1 hour 55 minutes before

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Special weather statement, Jun 26, 4:05 PM CDT, 1 hour 55 minutes before

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    <section class="card" role="status" aria-live="polite">
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Special weather statement, Jun 26, 4:28 PM CDT, 1 hour 32 minutes before

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<html lang="en">
<head>
  <meta charset="utf-8">
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  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 25, 8:22 PM CDT	Severe Thunderstorm Warning	LOT	Winnebago	63 min
Jun 25, 8:41 PM CDT	Tornado Warning	LOT	Winnebago	44 min
Jun 25, 8:59 PM CDT	Severe Thunderstorm Warning	LOT	Boone, McHenry	56 min
Jun 25, 8:59 PM CDT	Severe Thunderstorm Warning	LOT	Lake	56 min
Jun 25, 9:14 PM CDT	Tornado Warning	LOT	Lake, McHenry	31 min
Jun 25, 9:26 PM CDT	Tornado Warning	LOT	McHenry	34 min
Jun 26, 12:20 AM CDT	Flash Flood Warning	LOT	Boone, Winnebago	6 hr
Jun 26, 12:20 AM CDT	Flash Flood Warning	LOT	Lake, McHenry	6 hr
Jun 26, 2:50 AM CDT	Severe Thunderstorm Warning	LOT	Cook, DuPage, Will	40 min
Jun 26, 3:45 AM CDT	Severe Thunderstorm Warning	LOT	Cook, Will	60 min
Jun 26, 11:08 AM CDT	Flash Flood Warning	LOT	Boone	7 hr
Jun 26, 4:05 AM CDT	Severe Thunderstorm Warning	LOT	Jasper, Porter	70 min

Nearby

Flash Flood Warnings in Illinois, 1998 Every flash flood warning in 1998

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.